package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealDishMapper;
import com.sky.mapper.SetMealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetMealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

/**
 * @author 陈书憬
 * @version 1.0
 */
@Service
public class SetMealServiceImpl implements SetMealService {

    @Autowired
    private SetMealMapper setMealMapper;

    @Autowired
    private SetMealDishMapper setMealDishMapper;

    @Autowired
    private DishMapper dishMapper;

    //套餐分页查询
    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        PageHelper.startPage(setmealPageQueryDTO.getPage(), setmealPageQueryDTO.getPageSize());
        Page<SetmealVO> page = setMealMapper.pageQuery(setmealPageQueryDTO);
        long total = page.getTotal();
        List<SetmealVO> result = page.getResult();
        return new PageResult(total, result);
    }

    //套餐停售、启售
    @Override
    public void startOrStop(Integer status, Long id) {
        //起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含未启售菜品，无法启售"
        if (status == StatusConstant.ENABLE) {
            //select a.* from dish a left join setmeal_dish b on a.id = b.dish_id where b.setmeal_id = ?
            List<Dish> dishList = dishMapper.getBySetmealId(id);
            if (dishList != null && dishList.size() > 0) {
                dishList.forEach(dish -> {
                    if (StatusConstant.DISABLE == dish.getStatus()) {
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }

        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setMealMapper.update(setmeal);
    }

    //批量删除套餐
    @Override
    public void deleteByIds(List<Long> ids) {
        ids.forEach(id -> {
            Setmeal setmeal = setMealMapper.getById(id);
            if (StatusConstant.ENABLE == setmeal.getStatus()) {
                //起售中的套餐不能删除
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        });

        ids.forEach(setmealId -> {
            //删除套餐表中的数据
            setMealMapper.deleteById(setmealId);
            //删除套餐菜品关系表中的数据
            setMealDishMapper.deleteBySetmealId(setmealId);
        });
    }


    //根据id查询套餐
    @Override
    public SetmealVO getByIdWithDish(Long id) {
        //获取套餐id
        Setmeal setmeal = setMealMapper.getById(id);
        //获取套餐id对应的套餐菜品id
        List<SetmealDish> setmealDishes = setMealDishMapper.getByDishId(id);

        //将获得的封装在VO对象中
        SetmealVO setmealVO = new SetmealVO();

        //这里将获得的数据值赋值给VO
        BeanUtils.copyProperties(setmeal, setmealVO);

        //由于Setmeal没有SetmealDishes这一个集合，所以需要另外查询将值赋值给VO
        setmealVO.setSetmealDishes(setmealDishes);

        return setmealVO;
    }

    //修改套餐
    @Transactional
    public void updateWithDish(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);

        //修改套餐基本信息
        setMealMapper.update(setmeal);

        //删除原有口味数据
        setMealDishMapper.deleteByDishId(setmealDTO.getId());

        //插入新的口味数据
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealDTO.getId());
        });
        //向口味表插入n条数据
        setMealDishMapper.insertBatch(setmealDishes);
    }


    //新增套餐
    @Transactional
    public void saveWithFlavor(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);

        //在套餐中插入一条数据
        setMealMapper.insert(setmeal);

        //获取insert语句生成的主键值
        Long setmealId = setmeal.getId();

        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealId);
        });
        //向菜品表插入n调数据
        setMealDishMapper.insertBatch(setmealDishes);
    }


    /**
     * 条件查询
     *
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setMealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询菜品选项
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setMealMapper.getDishItemBySetmealId(id);
    }
}

//    //新增菜品和对应的口味
//    @Transactional
//    public void saveWithFlavor(DishDTO dishDTO) {
//
//        Dish dish = new Dish();
//        BeanUtils.copyProperties(dishDTO, dish);
//
//        //向菜品表插入1条数据
//        dishMapper.insert(dish);
//
//        //获取insert语句生成的主键值
//        Long dishId = dish.getId();
//
//        List<DishFlavor> flavors = dishDTO.getFlavors();
//        if (flavors != null && flavors.size() > 0) {
//            flavors.forEach(dishFlavor -> {
//                dishFlavor.setDishId(dishId);
//            });
//            //向口味表插入n条数据
//            dishFlavorMapper.insertBatch(flavors);
//        }
//    }


